This is true for all civilizations except the Abbasid Dynasty, which we cover below. You can also do this by pressing 'T' after selecting a villager. In this real-time strategy game, you must select a villager, then click the Advance Age button (Roman numeral) in the top right corner of their actions menu. Another change in AoE 4 is that you won't advance to the next age through the Town Center.
